Heater for garages and other uses



0.1. KUENHUm.

HEATER FOR GARAGES AND OTHER USES. APPLlcATloN min 05m13.191s. RENEWED MAY 6,1918.

9231 6D PatentedSept. 27, 1921.

4 SHEETS-SHEET 1..

0.1. KUENHOLD. HEATER FOR GARAGES AND THER USES. PPLICATIQN FILED DEC. 13. 1915. RENEWED MAY 6,1918.

392,01 Pandsept. 27, 1921.

' 4 SHEETS-SHEET 3- if "we 11 L* WTNESSES. /NVENTR F1 @.JKUE'NLD.,

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Half@ MAL Mmm/frs 0.1. KUENHOLD.

HEATER FOR GA RAGESAND OTHER USES. APPLIS/mon EILED 0m13.191s.

RENEWED MAY 6, H318.

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l BLEATERFOR GARAGES AND OTHER 'U'Slls` Specification of Letters Patent.

Patented Sept. 215.1921.

4 Application letvlpeeember 13, 1915, Serial No. G. Renewed Rey 6, 19M. Serie Nml.

To 1N who/.inizi meg @afneemt Be it known that i, OTTO J. KUeNHoLn, citizen of the United States, residing at Cleveland, in the county o-Cuyalioge and. Starte oi' hio, have invented certain new and useful improvements in Heaters for Garages end other Uses, of which the foi lowingr ise specification.

This invention pertains toi a heater for garages end other uses, all substantially is` perticulerly pointpendinga with and is therefore :i eontinuview of the burner.

ation .of .my earlier application; Serial No. 56515,'es to :ill subjeetmetter which is 'common to both 'applications In the accompanying drawings, l isa front end elevation of the lieeter or stove shown as adapted to be supported in part 'from e Weill by brackets :it its top and legs' et `itsl inner side endFig. 2 is :i side elevation of Fig. l., partly broken away et the rear and side.

Fig. 3 isn plan view-on line 3"?3, Fig. 4.

and Fig. e is a. vertical central sectional elevation lengthwise of the lower portion of the heater. y

Fig. 5 is e. perspective inside view of the mein or supporting front plate, end Fig. 6 is e eide elevation of one of the sifie plates. Fig., 7 is e perspective view of the end plete of the burner chamber, und 8 is e Iplein Fig; 9 is e cross section substantie-liv on line {5m-9, Fig. 2. Fig. 10 is e cross section of an auxiliary plete shown in Fig. ll.y on sectionA ine 10--10 thereon.` Fig. 1i is e front viev.7 of the said plete end which ce1# ries. the ignition-and other parte, and Fig.

1Q isa vertical sec-,tion thereof. Fig. 13 is e detail of e Winfiovv plete the front et the vieri' of scribed. i5 is e perspeetive view of e brush. adopted to eieanse the performed.

Figure j or gauze plates et the bottom of the iiezrter or steve. Fig. i6 is e perspective view et the lock plate. s

The heater es th eiieivn is for use more especie l. in places Where hydroarbo f to be found in ffieiigerous yonreine, enel oonstruetion is suoli that ignitien suoi) vapors through oit tie lieeter f, -1 possible. The burner oi.' the heater is in closed in suoli manner that its ieine canine.

ignite gases or vapors outside of tiie in closure$ and provision is made for preventing opening of the heater Wliie the burner is in'operetion, either to iight the burner for any other purpose, e mechanica-i igniting device iooeted within the heater, ont operabie from Without, being provided so es to Ineke opening of the heater nnneeeel sary. Air for the )rop:igetion enel supp-ori of combustion istek'en from the apartment in vvliieh the heater is located, therebyproviding Worm iiisteeol of Colei eirfer tiie jonrpose, and :it tile seme time avoiding; the den ger oi the tierno being fextii iisiieei or disturbed by wind or an exeeesive ireit which is likely to zittend where the nir teken troni out of eioors. This eleo simpiies the Work of installing. the heater. A fine is provided, designed to produce inst 5.

-the proper draftfor the most eiieetive 4operation of the lieeter; this is erwiinget to discharge the products of combustion into the apartment containing the heater. if desired, however, the products combustion may be vconducted Toy e supe; tine to e chimney or other outlet, enti provisen roede for preventing' eny-clistnrbenee oi' the draft under which the lieetw is 35- igned to operate, by conditions obteining in or irow duced by the superiiiie. l

To these several ends end others the steve is built up with e ni'irnoer oi pli-etes ai* .i parts which constitute.` first, onterioV closure, easing.; or weli, en inner heet retti i siting ineiosnre or drum sind :i combustion chamber within tire front thereof enel. :i draft tine open te the bottoni of seid recitieting chamber to eerry elle products of combustion.

The outer easing" comprises. e, rest iron 'iront' plete siievvn in i ti. upon which eli.` et the othe ere liie Sie" ere out neet niet:

- perte miem to the front plate .P and the back plate P. The bottom of the casing is open and the top is covered by a coarse wire mesh. The bottom of the combustion chamber is composed of two finely perforated V-shaped plates 3 and L1- set apart so as to leave a space be tween them. The air which enters the combustion chamber is required to pass through these plates. The rear portion of plate 3, designated by the numeral 11 in Fig. 4, is not perforated.

The said main or supporting front plate P is provided'with various flanges upon its inside with Which-to make sealed connection of the parts supported thereon as will now appear.V Thus, the said bottom plates 3 and l are seated snugly at their ends in the V- shaped channels on opposite sides of the rib or wall 5. and said. plates are united by a lock seam with the drum bottom which extends to the rear plate P.

The prime object ot introducingr air to the heater through a perforated screen is to prevent ignition by the burner of any gases or Vvapors which may surround the heater. It is well known that finely perforated metal, or wire gauze, will resist the passage y of llame and that inflammable gas on one side of such a screen will not be ignited by a flame on the othel side of the gauze. A single screen is sufficient for this purpose, provided the perforations are fine enough, and in my former amplication, Serial No. 56,515, l showed a heater having but al singlc screen. Nly object in using-a double screen is that larger pcrlorations may be used. affording ay freer entrance. for air and simplifying the problem of keeping the screen clean. The principle on which'the screen acts to prevent ignition of gasesoutside of the heater is this:

Various ignitible mixtures of gas or vapor and air have dili'erent ignitio., temperatures. Combustion will not start until theignition temperature is`reached and ceases if the temperature of the flame is reduced below the ignition temperature. A perforated screen is enabled to resist the passage of flame because of its ability to cool the vignited gas to a point below its ignition temperature and thus extinguish the flame. An inflammable gas may be passed through a perforated screen and ignited on the opposite side of the screen. The flame will burn close to the screen but not actually touch it, because in the immediate vicinity of the 'screen the heat is conducted away from the flame through the screen so fasttha't a telnperatttre high enough to permit combustion to continue cannot exist. It follows, therefore, that the most effective screen is one capable of conducting away the most heat. A copper screen isymore effective than an iron one; dull finished coppery would be more effective than polished. In case of aquantity of gas becoming ignited iu the heater; in other words. in case ot an internal explosion. the flame may bc hurled against the screen with such speed as to bc forced through the screen openings before it can be cooled to extinction by the screen. lt is possible to -make the openings small enough and the screen thick enough to prevent this, but there are practical objections to such a screen, so I prefer to make the screen double, with an air spacel'ietween. lVhile the first screen may not quite stop the llame it will retard and to some extent cool it, so that the outer screen is certain to stop it.

The. V-shaped screen affords a greater area for intake of air, proportional to the width of the chamber, and where moisture is present and condensation occurs in the heater the condensation will gravitate to the lower portion and not. close the perforations by capillary action as is likely to occur in a flat horizontal screen. In order to dispose of condensation I provide a drain tl', this in the present construction being a short tube screwed linto the rear plate P' at the lowest part of the drum. This tube is small in diameter relative to its length, 'so as to preclude the possibility of flame passing through it in the event of an explosion of gas in the drum. Scale and rust will also gravitate to the bottom of the V.

Lining plates 7 are provided at each sid( of the combustion chamber, and right angled ears e or lugs are used at th front bottom corners of said plates to seat in recesses fr in the inner flange 8 of the front plate P, while the front edges of the inner sheet metal walls of the inner drum Z are tightly seated in the channeled wall by said flanges` 8 and an adjacent flange 8. The rear Aends of said side lining plates have parallel rib: 13 forming grooves adapted to receive tht edges of the rear plate 12 of the'combustion chamber, said plate having shoulders 10 on which the lower edges of the side linings rest. The bottom of the plate 12 is V-shaped and sits down in the unperforated portion 11 of the plate 3.

The burner-B is preferably a hollowper.- forated body having lateral projections 14 at its respective corners adapted to rest upon the lugsor ledges e and 9 on the side lining plates 7. The inner ribs 13 on said plates are shorter than the outer ones and at their lower ends turn inward a short distance, these in-turned portions being above the ledges 9 a distance about equal to the vertical Width of the rear projections 14 on the Mbnrner, and. serving to prevent the rear end of the burner from lifting up. Gas is sup plied to said burner b the pipe connection 17 and the jet 18 disc arging into the mixing tube.19 fixed to the burner. The jet 18 enters through a lian ed mixer tube 20, which is closely packe about the samefbe- Abb ressure :id'ustin screw 28 and ienition g v s,

\ provided ignition bei 29 and spring 29" Leoncio tween the two plates D and E, und the flange on sind coller bears agonist lock plete E in `trent of seid pecking and confines seme in place. (Jouer plete D is fashioned to rest against the front piste `P with c. practically sealed closure, and it is featured :is seen par ticulerly in Figs. l0, 1l sind 12. Among the seid features is a, hole it opposite the end' of burner' adapted to receive e screw stud bolt 2l screwed into the burner and serving to lock the 'said parte together gainst or upon the inteigvening front plate l? through the list-faced en nier lugs e on the side plates 7, lig. Il f'he nut onsaid holt 2l is purposely blinded or conceded within e cavity or csp 22 on the lock plete E so that the seid bolt cannot be removed without dismantling the connections. This is in the interestof safety against accidentel esplosions es abovevdescribed; in other Words it is impossible to open the heater While a Home is burning inside.

New, following the features of the seidl cover pla-te D, it is especially to be noticed-s that it supports :in initial lighting or pilot jet, Which-lies e ges supply connection 25 with the pipe l? beneath end a specially device in the :ingle seen in Fig. l0 and comprising eV vrotstsble Shar ly milled Wheel 27 having s. stem and han le 28 to rotate the seme and adapted to engage the end of a. pyrophoric mtel pin or piece 29 held in contact thereWi h by a4 backing spring 29. In this wey a shower of sparks may be projected upward to ignite said initie-l jet or burner. This an rangement is especially desirable for present use because the spark is confined to the inside of the front of the stove or heater and not exposed outside. The pyrophoric memis held in place by` a..

occurs et the jet 2li- Which ignites the gas et the burner B. The milled Wheel 29 and itsoperating stem 285s placed at an angle7 preferably :it right angles, to the pyr-ophoric lmember 29 and its sdjusting screw 28, so

that both operatinge ports may be reached and manipulated from the outside,' and the yrophoric member repleced when needed. n briecover plete D requires no removal to operate or replace the-parts.

Fig. 15 shows a brush 33 of substantially V-shape with bristles' et both edges end adopted' to be used in the correspondingly shaped space between the two perforated lates or screens l :ind e Fic. 4. when the 5 t peroretions become fouled, es will unavoidably occui` from dust drawn in from the outside. This brush muy be operated by` e' stem( or handle 33 extending through the front plete. i

Figs. 13 emile show tivo holding frames 30 and 31, which are secured on opposite si des or" the cover plete D by tivo bolts or screws .Window is provided as s parts es cool as lighted the pilot cutting off certain expense and eliminating 'und nuts which are confined within square'- recess 3l in freine 83;. Y recesses the nut-s cennot be turned; there-y fore the frame llcennot bey removed without rst removing the plate D, this being impossible Without first breaking the fuel connection, ss will presently be more fully explained. The freine 30 with its glass Window 32 is on and the freine 3l with its mica Window on the outside thereof. In this We e double precaution against opening the stove and thereby possibly ig-V niting outside y the heater. The air space between the glass and mica servesl a very useful purpose in that it keeps the mice comparatively cool7 Being,r .in square the inside of seid plate gases from a flame Within so that it Will not laminate as mice even tuslly does in the presence of greet heet. Gla-ss, on the other hand.' is capable oi? Withvstanding intense heet provided it is sur-A rounded by oii'end is not subjected to sudden chilling. The mica therefore protects the glass from being broken by Water, which is liable to be splashed upon` it in a garage, or by cold drafts that might strike iti, when the gsi-'rage door is opened, While the glass protects the mice and preserves its trans parency. The inner frame projects down Ward to shield the ignition mechanism comprising Wheel 27 and member29 from theA intense heet, but an opening BO lis provided inl this freine opposite the pilot light for the pilot flame, and e vertical passage or space 34- is also left open between plate 30 and plete D for :in upward draft of air to supply the pilot light und to keep the. possible and avoid dra-wing of the temper out of the ignition mechanism. By this arrangement the ignition mechanism is isolated from the main burner, which it could not Well be if ,it Were required to light the burner drectly' After flame may be extinguished.7 heet from the immediate vicinity of the .igni tion device.

Further precaution is accomplished by the arrangement and connection of the several parte ut the front of the heater and in which the single bolt 2l is the key. Thus, vit :has been' seentlmt the parts 'constituting the combustion chamber. are' inte-:clocked with each other and the burner B, end they ore drown against the main front plate P and locken' therewith exclusively by 'said bolt 2l. Remove this bolt be disassembled. In front of this arrzingeu nient is the lock plete E, which covers holt 2l and prevents with by Wrench or the like, .is confined by the lenfre described. Mixer tube 20 control the sir 'passing to is in. turn confined by the and seid plate E possible tempering therei the burner is,

und said parte may on sleeve 20 as I sition.

gas supplvv pipes which are secured to the stove b v thc bracket b and the screw extension ot pilot valve 24, and hence accessability to thtl bolt 21 is possible only by first removing the fixed gas pipe connections, the. tube 2() and the cover pla'te E. This of course means cutting ott' the gas supply and the dismantlingof the heater. The lock plate E has a squared recess 22 to hold the nut 36 of the screw stud from turning. The nut 3G may be a separate or an intergral part of the stud 2l.

confining the rear plate 12 between the parallel ribs 13 .on the side linings forms a sort of slipjoint by which the' three plates are connected and permits outward move`` ment of the side walls, with consequent en largement of the combustion chamber, without opening the joints and permitting products of combustion to pass directly from the combustion chamber to the fine. The side walls ot the drum bear against the side lining plates and hold them in po- No bolts or screws are used through the drums or t-he lining plates. noi` are they needed with this arrangement, and the reason for so constructing the heater is to avoid leakage of gas through the drum and to permit ready expansion and lateral separation of the 'walls and parts without disrupting the heater during initial ignition of accumulated gases within the combustion chamber. The drum walls are otsheet metal and possess sutiicient spring qualities to yield and to hold the parts to gether. The top of the drum is V-shaped as well as the bottom, for two reasons. First, it preventsan accumulation of dust on the top, which would reduce radiation of; heat thert-ftrom, and. secondit .tacilitates'expain sion of the drinn in case ot an interior eX- plosion. The side walls having a large flat area. are enabled. because of their attachment to the V-shaped sections at the top and bottom` to bulge outward a considerable distance, thus greatly increasing the capacity ot the drum, momentarily, without any permanent distortion of the parts. v

As has been previously stated the products of combustion are carried ott by a tine l". This tine terminates, preferably, at about the plane of the top of the outer casing of the heater, and takes the products of combustion from the bottom ot the radiating compartment, thus compelling said products of combustion to traverse a long, circuitous path before reaching the fine. The cross sectional area 'of thefiue is made such with reference to its length that the draft'throngh the heater shall be rather slo\v,'so as -to require the products of combustion to pass lazily through the heater, giving up practically all of the heat contained therein. The capacity of the perforated plates 3 :ind 4 for admitting air is also gaged with this in View. In F ig. S2 the tlue is surmounted by a draftequalizing device which may be connected by a pipe to a chimney or other means for carrying the products of cornbustion from the building. This super-liuc., and therefore the draft equalizer, are not necessary, however, to the safety of the heater, the'fiue is so remote from the burner as practically to preclude the possibility of flame issuing from the upper end. But many persons object to the products of combustion entering the room, and in providingl for conducting them from the room I include the draft equalizer, so that whatever the new conditions may be the draft through the heater shall 'not Vbe materially affected. The draft equalizer comprises a cap fitted to the fiue F, said cap having lateral openings f. Surrounding this cap is .a hood f2, open at the bottom and supported at the top by'a short piece ot pipe, f3, which is in turn supported by the cap f. Openings f* in the pipe f3 allow products of combustion which have issued from openings f to enter pipe` f, The pipe f may be connccted to a chimney or some other super-tine and the products of 'combustion thereby conducted from the lniilding. By means of the Vdamper f5 the outlet through pipe f may be cnt oft. the products of comlmstion then being compelled to enter the room. rWith this arrangement the drat't in the fine is practically unaffected by the draft in the superfiuc, the large opening at the bottom oi" the.' hood admitting air from the room so freely as not to permit the super-line lo draw from the flue F.' Moreover. the cap f prevents down drafts Ytroni affecting the operation ot th(l heater.

The fine is secured to the heater by being fitted snugly in a hole at the bottom ot plate l. a collar /1 protruding outward from the plate. against which the throat of the elbopy jm impinges. rlhe end ot the elbow is" flanged over on the inside of plate P as at 7"", Fig. 2. so that it cannot be removed. lt will be seen therefore that the heater is sealed at all pointsl and that entrance thereto cannot be effected without first disconnecting the gasl service` or actually break ing some part ot the heater.

lVhat l claim is:

1. A heater having a combustion chamber which is sealed and locked to prevent ingress thereto and having an air intake. a. fiame-passage resisting screen and entrance guard for said air intake. a burner for said chamber1 an ignition device for said burner sealed and locked within said chamber, and means to operate said ignititn device externally of said chamber.

2, heater haring a fuel burner therein -and fuel connection for saill burner extend ing outside ot' said heater, and means to prevet access to the interior of said heater esencias dependent upon the separating of said fuel connections. J

3. A. hesiter having a burner therein and an air entrance leading thereto having a converging screen bottom, in combination With means Within said heater to clean said converging bottom.

el. A liieater having a burner therein and an air entrance beneath the saine provided with a dduble screen of V-shape in spaced relations, nd a cleaning brush in the space between said screens.

v 5.'ln a heater of the character described, comprising a main front plate and an auxiliary plate thereon, a burner and Walled` chamber therefor, and a single bolt locking said parts together.

6. in a heater of the character described, comprising a combustion chamber and a burner supported on the walls thereof, a main front plate and an auxiliary plate thereon and a single bolt engaged through said auxiliary plate with said burner and adapted to clamp said combustion chamber to said plates. Y

7. ln a heater of the character described, comprising 'a burner and a combustion chamber having side and end Walls interlocked therewith, a. main front plate having channels on its inside for said side plates,r a plate on the outside of said main plate and a bolt through the saine engaged in the end of said burner and adapted to clamp the said parts together.

8. In a heater of the character described, a combustion chaniber'aiid a. burner seated on the sides thereof and fuel connections therewith, a plate at the front of said chamlbei', a single boit clamping said plate and burner together Vand a cap' fixed over the head' of' said bolt to prevent access thereto and means confining said cap dependent for removal on the previous removal of the fuel `connections.

9. A heater having a combustion chamber, a heatradiating compartment into- Which p the products of combustion pass, an opening iii the combustion 'chamber covered `With a oraminoiis screen through which air for .the propagation and support of combustion is admitted, said screen being so constructed as to resist the passage of' llame there` through, and an unscreened vent flue through which the products of combustion may escape into the apartment containing the heater, the combustion chamber, `radiating compartment and vent llie combined forming passage of such length that the products of combustion will be cooled to a temperature belovif the temperature of ignition of any' gases which may surround the heater, before said products issue from the vent flue.

10. fh safety heater comprising a combustion chamber containing a gas burner, a

pilot burner adapted to llight the aforesaid main burner, a shield between the burners having a small hole through whichthe llame from the pilot burner passes to ignite the main burner, an opening for admitting fresh air to the chamber to propagate and support combustion, means whereby a portion ot' 'said fresh air may pass behind the shield, niting device behind said shield Where it is protected from the heat of the main burner and in the current of air that passes behind the shield, said device being adapted to light the pilot burner, and means for operating the igniting device from outside the heater.

il. In a safety heater, a Haine tight drum which in plan has the forni of a long, nai'- i'ovv, right angled paiallelogram, the top of the drum being an inverted V sha ieand its sides fiat, the sides being attache to other members atltheir four edges only, said Hat sides and V shaped top coperating to pen mit a substantial enlargement of the drum an igin case of an internal explosion, thereby v nnllifying the effect of the explosion by a tion chamber, a gas burner therein, and .a

window through whichA the flame of the burner may be observed, said Window containing two transparent members, the inner one being composed of glass and theretforer capable offs'tanding great heat Without its transparency becoming impaired, the outer memberl being of mica, said members being separated by anali' space.

13. In a heater, the combination with a ,combustion chamber having an opening covered With a foraniinous screen through which the air for the propagation and support of combustion is received :from the apartment containing the heater, a radiating compartment and a ue; of adral't equalizer also in said apartment, comprising a cap covering the top ot the flue, said cap having lateral openings for theoutlet of products of combustion, and ai hood surrounding the cap, said hood being adapted to connect to a chimney or other outlet whereby products of combustion discharged from said open-- ings may be carried from the apartment containing the heater, the bottom of the hood being open and adapted to admit air freely from the apartment, thereby eliminan ,ing substantially all possibility of the draft in the chimney affecting the draftin the heater flue, the combustion chamber, radiating compartment and flue combining to form a passage for the products of combustion of such length that the products of combustion will be cooled to a temperature below the temperature of ignition of any gases which may surround the-heater, before said products of combustion issue. from the flue.

14. ln a heater, the combination with a combustion chamber, a radiating, compartment and flue, of a draftequalizer in the apartment containing the heater comprising a cap covering the top of the flue, 'said cap having lateral openings for theoutlct of products ot combustion, a hood surrounding the cap, said hood being adapted to connect to a chimney or other outlet whereby products of combustion discharged from said openings may be carried trom the apart ment containing the heater, the bottom of the hood being open and adapted to admit air freely Jfrom the apartment, thereby eliminating substantially all possibility of the draft in the chimney affecting the draft in the heater flue, and a damper whereby the hood may be cut olf from the chimney, thereby forcing the products of combustion into the apartment, the combustion chamber, radiating compartment and flue combining to form a passage for the products of combustion of such length that the products of combustion will be cooled to a temperature below the temperature of ignition of any gases which may surround the heater, before said products of combustion issue from the flue.

15. ln a safety heater.r a closed drinn Vwhich in plan forms a long. narrow rectangle; said which with the flat sides gives to the drum the facility for considerable increase A in capacity under the strain of an internal explosiom the bottom and sides being comosed ot' thin flexible material: and a com lmstion chamber in one end of said drum` comprising two rigid plates lying loosely against said flexible walls` and a ln'idge, wall united to said plates by slip liointswhich permit the plates to move to and fro with thc flexible walls while maintaining an effective union with the bridge wall. the lower end of the bridge wall being V shaped and resting on the V shaped bottom the portion of the bottom within the combustion chamber being foraminous and adapted to admit air to the chamber for the support of combusdrum having a V shaped bottom,

tion, but' capable of resisting the passage of flame therethrough.

' 16. A heater comprising a sealed drum. a burner therein and a window through which the burner may be observed; saidwindow comprising a frame by which the transparent member is held in place, said frame being secured to the drum by bolts which pass through the frame and the drum wall, the heads of the bolts being within the drum and the nuts in square recesses in the frame, thereby preventing the removal of the frame without first gaining access to the interior of the drum.

17. A heater of the character described, comprising a gas burner confined in an inclosure to which air is admitted for the propagation and support of combustion, but from which a flame cannot escape into the room containing the heater, said burner having a mixing tube with an inlet to receive air from said inclosure; a movable element whereby the area of lsaid inlet may be varied` a member connected to said element and passing through tht` wall of the inclosure to the outside thereof, whereby said element may be moved from without the inclosure and the area of the inlet varied; and means whereby opening of the inclosure so that a flame could escape therefrom is prevented until al'ter the supply of gas to the burner has been cut off.

18. A heater of the character described, comprising a gas burner confined in an inlosure to which air is admitted for the propagation and support of combustiomlnt from which a flame cannot escape into the room containing the heater, said burner havs ing a mixing tube with an inlet to receive air 'from said inclosure', a movable element whereby thel area of said inlet may be varied, a member connected to said element and. passing through the wall of the inclosure to the outside thereof, whereby said element may be moved fronrwithout the inclosure and the area of the inlet varied', within the inclosure and means for lighting the pilot from the exterior of the heater without effecting an opening in the inclosure through which a flame might escape.

ln testimony whereof l affix my signature in presence of two witnesses.

OTTO J. KUENHOLD.

Witnesses i ll. B. Mossa, (lso. EKm'o11nt.

a pilot 

